Since there seems to be no custom actions for this input manager asset, I decided to make them myself.
It was pretty simple, just change the unity input lines 'input.getAxis' and such, to the hardshell inputs: hInput.getAxis, hInput.getButtonDown, etc etc...
I've linked custom actions for both 3.0 and 2.0 of the hardshell input manager.
2.0 for those who still use that
and 3.0 because thats the most up to date version.
Actions include:
Get Axis (stores a float)
Get Button (stores a bool)
Get Button Down (stores a bool and can send an event)
Get Button Up (stores a bool and can send an event)
Enjoy.